Lawn Scarifier (Petrol)

A lawn scarifier is used to dethatch your lawn. Thatch builds up between your soil and grass roots, preventing your lawn from breathing or absorbing nutrients and can cause a patchy lawn. 
The lawn scarifier will remove unwanted moss, weeds, dead grass and other natural build up of debris through cutting grooves into your soil. 
Firstly, you'll want to mow your lawn to the lowest possible grass length, dethatch using a scarifier or lawn dethatcher and then water and aerate your lawn to promote regrowth and recovery.